PTFE thread sealant. 12.7mm x 4.5m 200 roles per box PETRO-TAPE is a rugged, inert and highly resistant tape. It's impervious to steam, salt water, air, fuels, refrigerants, acids and alkalis (including sulfuric, hydrochloric, nitric, sodium hydroxide and chromic), solvents (including kerosene, aircraft oils, gasoline, diesel, carbon tet. and cleaning fluids), gases (including liquid and gaseous oxygen, hydrogen, ammonia, freon, chlorine, propane, natural gas, butane, acetylene and nitrogen). PETRO-TAPE is ≥3-mil thick and contains a light green pigment for easy identification. HEAVY DUTY - IDEAL FOR MULTIPURPOSE CONNECTIONS.